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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '788210ec2a7d1c65f604daa71d3185c2705c8f4ae665f5164ecaa11c5eae7266' 
  AND token = '9BZnn7uzaMqilWPyVvd2M1g+2M2/rXW+16FPwgnVi8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}